20015601 has 8 divisors (see below), whose sum is σ = 26837280. Its totient is φ = 13268832.

The previous prime is 20015591. The next prime is 20015623. The reversal of 20015601 is 10651002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20015601 - 2⁶ = 20015537 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20015641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18100 + ... + 19173.

It is an arithmetic number, because the mean of its divisors is an integer number (3354660).

Almost surely, 2^20015601 is an apocalyptic number.

It is an amenable number.

20015601 is a deficient number, since it is larger than the sum of its proper divisors (6821679).

20015601 is a wasteful number, since it uses less digits than its factorization.

20015601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37455.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 20015601 is about 4473.8798598085. The cubic root of 20015601 is about 271.5123226977.

Adding to 20015601 its reverse (10651002), we get a palindrome (30666603).

The spelling of 20015601 in words is "twenty million, fifteen thousand, six hundred one".